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Mechanical characteristics of undisturbed coral gravel soils: The intergranular void ratio as a common governing parameter
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| Title: | Mechanical characteristics of undisturbed coral gravel soils: The intergranular void ratio as a common governing parameter |
| Authors: | Watabe, Yoichi Browse this author | | Sassa, Shinji Browse this author | | Kaneko, Takashi Browse this author | | Nakata, Yukio Browse this author |
| Keywords: | Coral gravel soil | | Undisturbed sample | | Coral fragments | | Silt matrix | | Particle crush | | Mechanical properties | | Triaxial test |
| Issue Date: | Oct-2017 |
| Publisher: | The Japanese Geotechnical society |
| Journal Title: | Soils and foundations |
| Volume: | 57 |
| Issue: | 5 |
| Start Page: | 760 |
| End Page: | 775 |
| Publisher DOI: | 10.1016/j.sandf.2017.08.007 |
| Abstract: | Coral gravel soils are composite soils comprised of large fragments of finger coral and fine particles from silt matrixes. When the amount of coral fragments is small, the mechanical behavior of the coral gravel soil is mainly governed by the silt matrixes, and when the amount of coral fragments is large, the mechanical behavior is mainly governed by the coral fragments. Undisturbed samples, called high-quality samples in the present study, were collected at large-scale coastal construction sites in Okinawa Prefecture and Kagoshima Prefecture, Japan. A series of triaxial CD-tests was conducted in the laboratory to evaluate the mechanical characteristics of coral gravel soils. The test results were examined from various viewpoints to find a common governing parameter for the mechanical behavior of coral gravel soils. It was anticipated that it would be difficult to interpret the mechanical behavior of the high-quality samples in a uniform manner because undisturbed coral gravel soils, in the form of natural sediments, are generally very heterogeneous. To provide a reference for the parametric interpretation of the test results showing the remarkable features of coral gravel soils, such as interlocking and particle crushing, the test data newly obtained for the high-quality samples were compared to the previous test results obtained for reconstituted mixtures having various volumetric percentages of coral fragments. It was found that an intergranular void ratio corresponding to 0.075 mm, in which particles finer than a grain size of 0.075 mm (i.e., particles of clay and silt) are regarded as voids, can be employed as a useful parameter in evaluating the shear strength of both reconstituted and undisturbed coral gravel soil samples. |
| Rights: | © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/75632 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 渡部 要一
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